Oxygen Self-Diffusion in Cubic ZrO2 Solid Solutions

  • Yasumichi Oishi
  • Ken Ando
Part of the NATO ASI Series book series (NSSB, volume 129)

Abstract

Because of the interest in their application to solid electrolyte, electrical conductivity has been extensively determined for various stabilized ZrO2 by many investigators. In contrast, direct determination of the oxygen tracer diffusion coefficient has been made only for CaO-stabilized ZrO2 by Kingery et al. (1959) and later by Simpson and Carter (1966). Agreement of the oxygen self-diffusion coefficient with the electrical conductivity determined by Kingery et al. proved that CaO-stabilized ZrO2 is an oxygen ionic conductor due to the temperature-independent oxygen vacancies resultant from substitution of divalent Ca ions for Zr ions in the fluorite structure. The determined activation energy, 127 kJ/mol, was interpreted to be the migration energy for the oxygen ion.

Keywords

Migration Dioxide Zirconia Uranium Fluorite 

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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Yasumichi Oishi
    • 2
  • Ken Ando
    • 1
  1. 1.Department of Nuclear Engineering Faculty of EngineeringKyushu UniversityFukuokaJapan
  2. 2.R & D LaboratoriesNGK Insulators, Ltd.NagoyaJapan

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